Sharepoint 2010 Custom Visual Webpart button click event firing on page refresh

I have developed a Visual Webpart to create a list in SP using vs2010 and the button click event I have written the list create method. If I click the button list is created successfully. And I refresh the page again list is creating(Again button
click event is triggering).please help me to solve the issue.
protected void Button1_Click(object sender,
EventArgs e)
            SPWeb web
= SPContext.Current.Web;
            //SPList list=web.Lists["Auto"];
            SPList list
= web.Lists[DropDownList2.SelectedItem.Text];
            if
(string.IsNullOrEmpty(TextBox1.Text)
|| string.IsNullOrEmpty(DropDownList1.Text))
Label4.Text =
"Fields Are Empty";
            else
if (DropDownList1.SelectedItem.Text
== "Single line of Text")
                list.Fields.Add(TextBox1.Text,
SPFieldType.Text,
true);
SPView viewname = list.Views["All Items"];
                viewname.ViewFields.Add(TextBox1.Text);
//viewname.Update();
                list.Update();
Label4.Text =
"Field Created Successfully";
TextBox1.Text =
string.Empty;
// Label4.Text = string.Empty;

Hi,
This is because the request is sent to the server when you refresh the page.
A workaround for this is that we can “provide a refresh link that redirects to the same page (or if you have some action causing the refresh programmatically, you could just
redirect to the page after that, with Response.Redirect)
so that page is requested by the browser (with GET method, default with hyperlinks)”.
More information:
http://social.msdn.microsoft.com/Forums/sharepoint/en-US/45648b39-1229-405c-ac9e-60eb82905982/click-event-getting-fired-on-page-refresh
Or we can use the Session to save a value which used as a flag for us to check whether it is a page refresh and perform accordingly.
http://www.codeproject.com/Articles/28099/Refresh-Page-Issue-in-ASP-Net
http://www.codeproject.com/Articles/10240/Detecting-Page-Refresh
Thanks
Patrick Liang
TechNet Community Support

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